An experimental study on absorptivity measurement of superabsorbent polymers (SAP) and effect of SAP on freeze-thaw resistance in mortar specimen

Kim, Il Sun; Choi, So Yeong; Choi, Yoon Suk; Yang, Eun Ik

doi:10.1016/j.conbuildmat.2020.120974

Cited by 19 publications

(13 citation statements)

References 30 publications

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“…This was an expected result because different amounts of WRA were used for each concrete specimen so that the target slump could be reached. In a previous study [ 19 ], the slump value decreased as the content of SAP increased. The slump value reduction due to the absorption of mixing water by SAPs is already well known.…”

Section: Resultsmentioning

confidence: 80%

“…The air content of hardened concrete mixed with SAPs may increase [ 36 ]. In fresh concrete, however, this tendency cannot be accurately measured by air content measurements using the pressure method [ 19 ]. Therefore, it is judged that the accurate air content of concrete mixed with SAP must be measured using hardened concrete.…”

Section: Resultsmentioning

confidence: 99%

“…The same compressive strength as that of the reference mix was observed when the SAP content was 1.5%. For water curing, the internal curing effect by the drying of the SAP cannot be expected because the inside and outside of concrete were maintained under wet conditions [ 19 ]. In addition, the compressive strength is affected by the strength increase due to a reduction in the effective W/C ratio caused by the water absorption characteristics of SAP and the strength decrease due to the increase in SAP pores.…”

Section: Resultsmentioning

confidence: 99%

“…The absorptivity of SAP affects the workability and characteristics of concrete. The maximum water absorptivity of SAPs obtained from a previous study [ 19 ] is shown in Table 3 . The time required to reach the maximum absorptivity (saturation state) of the SAP was less than 3 min.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…SAPs decrease workability by absorbing mixing water, and workability rapidly decreases as the SAP content increases [ 19 ]. In addition, owing to the absorption of mixing water by the SAP, the actual W/C ratio (effective W/C ratio) becomes lower than the design W/C ratio.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Internal Pores Formed by a Superabsorbent Polymer on Durability and Drying Shrinkage of Concrete Specimens

Kim

Choi

et al. 2021

Materials

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In this study, the effect of internal pores formed by a superabsorbent polymer (SAP) was analyzed by evaluating the compressive strength, chloride penetration depth, drying shrinkage, and pore size distribution of SAP-containing concrete, while securing workability using a water-reducing agent (WRA). The experimental results showed that the amount of WRA necessary increased as the amount of SAP added increased, and that the compressive strength was the highest when the SAP content was 1.5% of the concrete mix. Drying shrinkage tended to decrease as the SAP content increased, and it decreased by approximately 31–41% when the SAP content was 2.0% compared to that of the reference mix. The SAP expanded by approximately three times inside concrete, and it was distributed within the internal pores of air-entrained concrete. The optimal SAP content in concrete mix was 1.5%, and an SAP content of 2.0% or higher adversely affected the workability and compressive strength.

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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